JPH0237322A - Panel light emitting device - Google Patents

Panel light emitting device

Info

Publication number
JPH0237322A
JPH0237322A JP63188825A JP18882588A JPH0237322A JP H0237322 A JPH0237322 A JP H0237322A JP 63188825 A JP63188825 A JP 63188825A JP 18882588 A JP18882588 A JP 18882588A JP H0237322 A JPH0237322 A JP H0237322A
Authority
JP
Japan
Prior art keywords
light
guide plate
plate
light guide
light sources
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP63188825A
Other languages
Japanese (ja)
Other versions
JPH0679119B2 (en
Inventor
Masahiko Tada
雅彦 多田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP63188825A priority Critical patent/JPH0679119B2/en
Priority to KR1019890009907A priority patent/KR930002926B1/en
Priority to US07/385,175 priority patent/US5050046A/en
Publication of JPH0237322A publication Critical patent/JPH0237322A/en
Publication of JPH0679119B2 publication Critical patent/JPH0679119B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/14—Arrangements of reflectors therein
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/35—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being liquid crystals
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0083—Details of electrical connections of light sources to drivers, circuit boards, or the like
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/0418—Constructional details
    • G09F13/0422—Reflectors
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/14—Arrangements of reflectors therein
    • G09F2013/145—Arrangements of reflectors therein curved reflectors

Abstract

PURPOSE:To uniformize the intensity of the light radiated from the surface of a light guide plate regardless of the positions of the plate surface by disposing the light guide plate in such a manner that said plate has the end faces formed to enclose light sources and the short side direction is the direction where the brightness of the light sources is low. CONSTITUTION:The optical fiber 11 is so disposed to the light sources 9, 10 having various intensities in the brightness distribution that said plate has the end faces 11a, 11g formed to enclose the light sources 9, 10 and the short side direction thereof is the direction where the brightness of the light sources 9, 10 is low. A scattering and reflecting layer 11b for reflecting pat of the light entering form the end faces 11a, 11g is provided to the rear surface of the plate 11. The incident light rays from the light sources 9, 10 on the inside of the plate 11 from the end faces 11a, 11g are, therefore, uniformized in the part of the light guide plate near the light sources 9, 10 and the part of the light guide plate further from the light sources 9, 10. The light rays radiated from the plate surface of the plate 11 are generated uniformly over the entire surface in this way.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、例えば液晶表示パネルの背面照明等を行な
う面発光装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a surface emitting device for backlighting a liquid crystal display panel, for example.

〔従来の技術〕[Conventional technology]

この種の従来の技術として、例えば実開昭６２−６９２
８１号公報に記載のものがある。このものは、第５図に
示すように、導光板１と、その端面に設けられた白熱電
球２．ａ、２ｂと、これら導光板１および白熱電球２ａ
、２ｂとを囲む反射枠３等によって構成され、白熱電球
２ａ、２ｂからの光を導光板１に導き、導光板１の背面
に施された散乱反射層（図示せず）によって上記光を散
乱反射させ、導光板１の板面から放射させるようにした
ものである。これによって導光板１の前面に設けた液晶
表示パネル（図示せず）等を照明することができろもの
である。As a conventional technique of this kind, for example, Utility Model Application No. 62-692
There is one described in Publication No. 81. As shown in FIG. 5, this device includes a light guide plate 1, an incandescent light bulb 2. a, 2b, these light guide plate 1 and incandescent light bulb 2a
, 2b, guides the light from the incandescent lamps 2a and 2b to the light guide plate 1, and scatters the light by a scattering and reflective layer (not shown) provided on the back surface of the light guide plate 1. The light is reflected and radiated from the surface of the light guide plate 1. This makes it possible to illuminate a liquid crystal display panel (not shown) and the like provided on the front surface of the light guide plate 1.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上記のように構成した従来の面発光装置は、例えば第６
図に示すように白熱電球２ａがそのフィラメント２ａ’
の長手方向が導光板１の端面１ａと平行となるように配
設された場合、白熱電球２ａの輝度の分布は図示Ａ（点
線上では光が同じ強さであることを示す）のようになり
、導光板１の端面１ａのうち白熱電球２ａに近い部分で
は入光量が多く、同じ（遠い部分では入光量は少なくな
咋、結局、入光量の分布は図示Ｂのようになる。また第
７図に示すように白熱電球２ａ、２ｂから発せられた光
の入射角が導光板１の臨界角（アクリル導光板の場合は
約４５°）以上の光は導光板１の内部に入射することな
く反射する。このため導光板１の板面からの放射光は白
熱電球２ａの近くが強く、遠い部分では弱くなって均一
な面発光が得られないという課題があった。The conventional surface emitting device configured as described above has, for example, a sixth
As shown in the figure, an incandescent light bulb 2a has a filament 2a'
When the longitudinal direction of the incandescent light bulb 2a is arranged parallel to the end surface 1a of the light guide plate 1, the brightness distribution of the incandescent light bulb 2a is as shown in Figure A (dotted lines indicate that the light intensity is the same). Therefore, the amount of incident light is large in the portion of the end surface 1a of the light guide plate 1 that is close to the incandescent bulb 2a, and the amount of incident light is the same (the amount of incident light is small in the far portion).In the end, the distribution of the amount of incident light is as shown in Figure B. As shown in FIG. 7, the light emitted from the incandescent bulbs 2a and 2b whose incident angle is equal to or larger than the critical angle of the light guide plate 1 (approximately 45° in the case of an acrylic light guide plate) cannot enter the inside of the light guide plate 1. For this reason, the light emitted from the plate surface of the light guide plate 1 is strong near the incandescent light bulb 2a, and weak in the far part, so that there is a problem that uniform surface light emission cannot be obtained.

この発明は上記のような課題を解消するためになされた
もので、放射光の強度が場所によらずに均一に発光する
乙とのできる面発光装置を得ろことを目的とする。This invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a surface emitting device that can emit light with uniform intensity regardless of location.

〔課題を解決するための手段〕[Means to solve the problem]

この発明に係ろ面発光装置は、輝度分布に強弱のある光
源に対し、該光源を包囲するように形成した端面を有し
、かつ光源の輝度の少ない方向が短手方向となるように
導光板を配設し、導光板の背面に上記端面から入射した
光の一部を反射させるための散乱反射層を設けたもので
ある。A flat light emitting device according to the present invention has an end face formed to surround a light source having a strong or weak brightness distribution, and guides the light source so that the direction of low brightness is the transverse direction. A light plate is provided, and a scattering reflection layer is provided on the back surface of the light guide plate to reflect a part of the light incident from the end face.

〔作　用〕[For production]

この発明においては、端面から導光板内に入射した光源
からの光は、光源に近い導光板部分と光源に遠い導光板
部分とで均一となり、これによって導光板の板面からの
放射光が全面から均一に発生する。In this invention, the light from the light source that enters into the light guide plate from the end surface becomes uniform between the light guide plate portion close to the light source and the light guide plate portion far from the light source, so that the light emitted from the plate surface of the light guide plate is distributed over the entire surface. Occurs uniformly from

〔実施例〕〔Example〕

以下、この発明の一実施例を図について説明する。第１
図はこの発明による面発光装置の第２図におけるＩ−Ｉ
線断面図、第２図は第１図におけるＩＩ−ＩＩ線側断面
図、第３図は要部拡大断面図である。図において、４は
表示パターン（図示せず）が透明ｔｌｉｉ　（図示せず
）によって形成され、制御口ｎＩ（図示せず）の信号に
基づき、所定の表示パターンを点消灯させる液晶表示パ
ネルであり、液晶材料（図示せず）を挾持する第１およ
び第２ガラス板４ａおよび４ｂを有している。４ａ’は
第１ガラス板４ａ上に、透明電極の端子を配列した端子
部、５ａないし５ｈは液晶表示パネル４の端子部４ａ’
の各透明電極とそれぞれ電気的に接続されたリードであ
り、各リード、例えば、リード５Ｃの挾持部５ｃ’が第
１ガラス板４ａの端子部４ａ’を挟持している。６は液
晶表示パネル４の背面、すなわち第２ガラス板４ｂ側に
配設され、光を散乱させて均一化する透光性の調光板、
７は調光板６の背面に配設され、光を着色する有色透光
性の濾光板、８は液晶表示パネル４のリード５ａないし
５ｈが半田付されたプリント基板、９，１０は、プリン
ト基板８にリード９ａが半田付された白熱電球からなる
光源、９ｂ、１０ｂは、光ａ９゜１０のフィラメントで
あり、第１図において、長手方向が図示上下方向となる
ように、光源９，１０が配設されている。An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is I-I in FIG. 2 of the surface emitting device according to the present invention.
2 is a sectional view along the line II--II in FIG. 1, and FIG. 3 is an enlarged sectional view of the main part. In the figure, 4 is a liquid crystal display panel in which a display pattern (not shown) is formed by a transparent tlii (not shown), and a predetermined display pattern is turned on and off based on a signal from a control port nI (not shown). , has first and second glass plates 4a and 4b that sandwich a liquid crystal material (not shown). 4a' is a terminal section in which transparent electrode terminals are arranged on the first glass plate 4a, and 5a to 5h are terminal sections 4a' of the liquid crystal display panel 4.
The clamping portion 5c' of each lead, for example, the lead 5C, clamps the terminal portion 4a' of the first glass plate 4a. Reference numeral 6 denotes a light-transmitting light control plate disposed on the back side of the liquid crystal display panel 4, that is, on the second glass plate 4b side, which scatters and makes the light uniform.
7 is a colored light-transmitting filter plate disposed on the back side of the light control plate 6 and colors the light; 8 is a printed circuit board to which the leads 5a to 5h of the liquid crystal display panel 4 are soldered; 9 and 10 are printed circuit boards; The light sources 9b and 10b, which are incandescent light bulbs with leads 9a soldered to the substrate 8, are filaments of light a9°10, and in FIG. is installed.

１１は光源９，１０をそれぞれ包囲する略円形状の光の
入射する端面１１ａ、ｌ１ｇを有する導光性の例えば°
アクリル樹脂等からなる導光板で、上記端面１１ａ、ｌ
１ｇから入射した光（よ背面に設けた白色塗装膜等の散
乱反射層１１ｂで散乱反射させ、板面１１ｃから放射す
る。１２は脚部１２ａがプリント基板８に半田付けされ
、光源９，１０および導光板１１の光源近接部を包囲部
１２ｂ。Reference numeral 11 denotes a light guide having substantially circular light incident end surfaces 11a and 11g surrounding the light sources 9 and 10, respectively.
A light guide plate made of acrylic resin or the like, and the end surfaces 11a, l
The light incident from 1g is scattered and reflected by a scattering/reflection layer 11b such as a white paint film provided on the back surface, and radiated from the board surface 11c. and a portion 12b surrounding the light source proximate portion of the light guide plate 11.

１２ｃで包囲すると共に、導光板１１の３つの端面１１
ｄ、ｌｉｅ、ｌ’ｌｆに密接して導光板１１を保持する
例えばアルミ板等からなる反射枠であって、これら光８
９，１０、導光板１１および反射枠１２によって面発光
装置１３を構成している。12c, and the three end surfaces 11 of the light guide plate 11.
A reflective frame made of, for example, an aluminum plate, which holds the light guide plate 11 in close contact with the light guide plate 11,
9, 10, a light guide plate 11, and a reflective frame 12 constitute a surface emitting device 13.

次にこの発明による面発光装置の作用について説明する
。光源９，１０はそれぞれフィラメント９ｂ、１０ｂが
導光板１１の長手方向（第１図の左右方向）と直角とな
るように配設されており、第４図に示すように光源９の
輝度分布は図示Ｃのようになる。従って導光板１１の端
面１１ａのうち、光源９のフィラメント９ｂに平行とな
る方向では光源９の輝度は弱く、光源９のフィラメント
９ｂに垂直となる方向では光源の輝度は強くなる。Next, the operation of the surface emitting device according to the present invention will be explained. The light sources 9 and 10 are arranged such that the filaments 9b and 10b are perpendicular to the longitudinal direction of the light guide plate 11 (the left-right direction in FIG. 1), and the brightness distribution of the light source 9 is as shown in FIG. The result will be as shown in figure C. Therefore, in the end surface 11a of the light guide plate 11, the brightness of the light source 9 is weak in the direction parallel to the filament 9b of the light source 9, and the brightness of the light source is strong in the direction perpendicular to the filament 9b of the light source 9.

ところが、導光板１１の端面１１ａは光源９に対し同心
円形に包囲しており、光源からの光ｌよ常に導光板１１
の端面１１ａに対し法線方向に入射するため、光は端面
１１ａの臨界角度を越える乙となく光源９の殆んど全角
度に対して同一の入射効率を得る。この結果、図示りの
ように光源９に近い部分と遠い部分において障度差は極
めて小さくなる。この差は第３＠−に示すように反射枠
１２の光源包囲部１２ｂの形状を適宜設計することによ
りなくすことができる。例えば実施例では光源包凹部１
２ｂの反射面１２ｂ′を光源９から遠い部分で導光板１
１の長手方向と４５°の角度をなすように構成して反射
光を取入れろことにより光量を補っている。However, the end surface 11a of the light guide plate 11 surrounds the light source 9 in a concentric circle, and the light l from the light source is always different from the light guide plate 11.
Since the light is incident in the normal direction to the end surface 11a, the light has the same incidence efficiency for almost all angles of the light source 9 without exceeding the critical angle of the end surface 11a. As a result, as shown in the figure, the difference in degree of disability between a portion close to the light source 9 and a portion far from the light source 9 becomes extremely small. This difference can be eliminated by appropriately designing the shape of the light source surrounding portion 12b of the reflection frame 12, as shown in the third @-. For example, in the embodiment, the light source envelope recess 1
The reflective surface 12b' of the light guide plate 1
The amount of light is supplemented by incorporating reflected light by arranging it at an angle of 45° with the longitudinal direction of the light source.

このように導光板１１の長手方向のどの部分においても
短手方向へ入射する光量を略等しくすることができるた
め、端面１１ａから入射した光は導光板１１全体に均一
に伝搬し、その後散乱反射層１１ｂで散乱反射され、導
光板１１の板面１１Ｃから放射される。従って、第１図
で見た導光板１１の板面１１Ｃの各点におけろ輝度分布
は略均−なものとなり、板面１１ｃからの放射光は濾光
板７を均一に照明する。つぎに、上記放射光は、濾光板
７を通ることにより着色され、調光板６で輝度分布をさ
らに均一化された後、液晶表示パネル４を照明する。こ
のように、導光板１１の板面１ｉｅＬよ均一な発光面と
なり、液晶表示パネル４を均一に照明することができろ
。In this way, the amount of light incident on the transverse direction can be made approximately equal at any part in the longitudinal direction of the light guide plate 11, so that the light incident from the end face 11a propagates uniformly throughout the light guide plate 11, and is then scattered and reflected. The light is scattered and reflected by the layer 11b and is emitted from the plate surface 11C of the light guide plate 11. Therefore, the luminance distribution at each point on the plate surface 11C of the light guide plate 11 as seen in FIG. Next, the emitted light is colored by passing through the filter plate 7, and the luminance distribution is further made uniform by the light control plate 6, and then the liquid crystal display panel 4 is illuminated. In this way, the plate surface 1ieL of the light guide plate 11 becomes a more uniform light emitting surface, and the liquid crystal display panel 4 can be uniformly illuminated.

ところで、この実施例においては、光源９，１０を液晶
表示パネル４の端子部４ａの裏側に配設しているため、
光源９，１０および光源包囲部１２ｂ。By the way, in this embodiment, since the light sources 9 and 10 are arranged on the back side of the terminal section 4a of the liquid crystal display panel 4,
Light sources 9, 10 and light source surrounding portion 12b.

１２ｃのための特別な占有場所（例えば第１図に示す位
ｆａｔＥ）を必要とせず、装置の占めろ占有面積を小さ
くすることができる。It is not necessary to occupy a special space for the device 12c (for example, the area fatE shown in FIG. 1), and the area occupied by the device can be reduced.

さらに、この実施例においては、リード５ａないし５ｈ
と接続された第１ガラス板４ａを外側にし、第２ガラス
板４ｂを面発光装置！１３側にしたため、反射枠１２の
光源包囲部１２ｂ、１２ｃとリード５ａないし５ｈの挾
持部５ｃ’との間隔を広くとれ、これにより、反射枠１
２が導電性を有している場合には反射枠１２によるリー
ド５ａないし５ｈ同志の短絡が生じにくくなるものであ
る。Furthermore, in this embodiment, the leads 5a to 5h
With the first glass plate 4a connected to the outer side and the second glass plate 4b as a surface emitting device! 13 side, the distance between the light source surrounding parts 12b and 12c of the reflective frame 12 and the clamping parts 5c' of the leads 5a to 5h can be widened.
When the leads 2 have conductivity, short circuits between the leads 5a to 5h due to the reflective frame 12 are less likely to occur.

なお、実施例では液晶表示パネルを照明する場合につい
て説明したが、その他の透光性表示パネルを表示する場
合や単に照明装置として使用する場合にも利用できるこ
とは言うまでもない。In addition, although the case where a liquid crystal display panel was illuminated was explained in the Example, it goes without saying that it can also be used when displaying other translucent display panels or when simply using it as a lighting device.

〔発明の効果〕〔Effect of the invention〕

以上説明したようにこの発明によれば、光源を包囲する
ように形成した端面を有し、かつ光源の輝度の少ない方
向が短手方向となるように導光板を配設したので、端面
から導光板内へ入射した光源からの光は、光源に近い導
光板部分と遠い導光板部分とで均一となる。これによっ
て、導光板の板面からの放射光の強さが板面の位置に拘
わらず均一になるという効果がある。As explained above, according to the present invention, the light guide plate has the end face formed to surround the light source and is disposed so that the direction of low brightness of the light source is the transverse direction, so that light is guided from the end face. The light from the light source that enters the light plate becomes uniform between the light guide plate portion close to the light source and the light guide plate portion far from the light source. This has the effect that the intensity of the light emitted from the plate surface of the light guide plate becomes uniform regardless of the position of the plate surface.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図はこの発明の一実施例による面発光装置の第２図
におけるＩＩ線断面図、第２図は第１図の■−■線側断
面図、第３図は光源付近の要部拡大断面図、第４図は光
源の強度分布の平面図、第５図は従来の面発光装置の斜
視図、第６図は従来のものの光源の強度分布の平面図、
第７図は光源の光の導光板への入射角度を説明するため
の概略図である。 ９．１０・・・光源、１１・・導光板、ｌｌａ・・・端
面、１１ｂ・・・散乱反射層。 なお、図中同一符号は同−又は相当部分を示す。 第１図 第２図 １１：導光板 １１ｏ：端面 １１ｂ：散乱反射層 第３図1 is a sectional view taken along the line II in FIG. 2 of a surface emitting device according to an embodiment of the present invention, FIG. 4 is a plan view of the intensity distribution of the light source, FIG. 5 is a perspective view of a conventional surface emitting device, and FIG. 6 is a plan view of the intensity distribution of the conventional light source.
FIG. 7 is a schematic diagram for explaining the angle of incidence of light from a light source onto a light guide plate. 9.10... Light source, 11... Light guide plate, lla... End surface, 11b... Scattering reflection layer. Note that the same reference numerals in the figures indicate the same or equivalent parts. Figure 1 Figure 2 Figure 11: Light guide plate 11o: End surface 11b: Scattering reflective layer Figure 3

Claims (1)

【特許請求の範囲】[Claims] 輝度分布に強弱のある光源に対し、該光源を包囲するよ
うに形成した端面を有し、かつ光源の輝度の少ない方向
が短手方向となるように導光板を配設し、導光板の背面
に上記端面から入射した光の一部を反射させるための散
乱反射層を設けたことを特徴とする面発光装置。For a light source that has a strong or weak brightness distribution, a light guide plate is arranged so that the end face is formed to surround the light source, and the direction of the light source with less brightness is the short side, and the back side of the light guide plate is A surface emitting device characterized in that a scattering reflection layer is provided for reflecting a part of light incident from the end surface.
JP63188825A 1988-07-27 1988-07-27 Surface emitting device Expired - Lifetime JPH0679119B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP63188825A JPH0679119B2 (en) 1988-07-27 1988-07-27 Surface emitting device
KR1019890009907A KR930002926B1 (en) 1988-07-27 1989-07-12 Panel light emitting devices
US07/385,175 US5050046A (en) 1988-07-27 1989-07-26 Surface lighting apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63188825A JPH0679119B2 (en) 1988-07-27 1988-07-27 Surface emitting device

Publications (2)

Publication Number Publication Date
JPH0237322A true JPH0237322A (en) 1990-02-07
JPH0679119B2 JPH0679119B2 (en) 1994-10-05

Family

ID=16230485

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63188825A Expired - Lifetime JPH0679119B2 (en) 1988-07-27 1988-07-27 Surface emitting device

Country Status (3)

Country Link
US (1) US5050046A (en)
JP (1) JPH0679119B2 (en)
KR (1) KR930002926B1 (en)

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Publication number Priority date Publication date Assignee Title
CN104183590A (en) * 2013-05-27 2014-12-03 郭锦标 Planar light source device and method for manufacturing light guide plate thereof

Also Published As

Publication number Publication date
US5050046A (en) 1991-09-17
JPH0679119B2 (en) 1994-10-05
KR930002926B1 (en) 1993-04-15
KR900002229A (en) 1990-02-28

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